Reduce fluctuations in QP (before curve compression) [20.0] –qblur (x264) -qblur (FFmpeg) Reduce fluctuations in QP (after curve compression) [0.5] –zones /(x264) UNKNOWN (FFmpeg) Allows setting a specific quantizer for a specific region of video. –qpfile (x264) UNKNOWN (FFmpeg) Al...
$ ffplay -f<文件格式>-pixel_format<像素格式>-video_size<视频尺寸>-i<文件路径> 其中,-pixel_format表示像素格式,可以用ffplay -pix_fmts命令开查看当前支持的格式。 示例: $ffplay-frawvideo-pixel_formatyuv420p-video_size1280x720-iinput.yuv 3)播放编码数据 使用ffplay 播放编码后的视频或音频文件如下...
$ ffmpeg-re-i input.mp4-c copy-f hls-bsf:v h264_mp4toannexb output.m3u8 因为默认是 HLS 直播,所以生成的 M3U8 文件内容会随着切片的产生而更新。这里多了一个-bsf:v h264_mp4toannexb参数,它的作用是将 MP4 中的 H.264数据转换为 H.264 AnnexB 标准的编码,AnnexB 标准的编码常见于实时传输流...
FFmpeg provides a versatile and powerful solution for video compression. With the detailed steps from installation to compression outlined in this guide, you can now effectively reduce file size while maintaining acceptable quality. FFmpeg has endless features and is worth further exploration whether you...
If you wonder how to produce GIF animation from any video tutorial, the answer isffmpeg. Learn it once and use it forever. This short article explains 2 steps to produce GIF in small size from MP4 and WEBM videos. I hope by reading this article, anyone usesKazam to record screencan pro...
If the video is a high definition file, and we want to scale it down to reduce the size, then we can use the scale control commands. ffmpeg -i <input file> -vf scale=<width>:<height>:flags=lanczos <output file> lanczosis the algorithm of zoom, and if we want to set the width ...
In this example we will reduce the resolution of a video in HD format (1920x1080 pixels) to 640x360 (this is a fairly used configuration for aspect ratio 16:9):ffmpeg -i video_1920.mp4 -vf scale=640:360 video_640.mp4 -hide_bannerIt is only necessary to indicate the scale video ...
>avctx_inited) { int orig_w = st->codecpar->width; int orig_h = st->codecpar->height; ret = avcodec_parameters_from_context(st->codecpar, st->internal->avctx); if (ret < 0) goto find_stream_info_err; #if FF_API_LOWRES // The decoder might reduce the video size by the ...
Reduce fluctuations in QP (after curve compression) [0.5] –zones /(x264) UNKNOWN (FFmpeg) Allows setting a specific quantizer for a specific region of video. –qpfile (x264) UNKNOWN (FFmpeg) Allows one to read in a set of frametypes and quantizers from a file. Useful for testing vari...
MP4 (MPEG-4 Part 14) D psxstr Sony Playstation STR D pva TechnoTrend PVA D pvf PVF (Portable Voice Format) D qcp QCP D qdraw_pipe piped qdraw sequence D r3d REDCODE R3D DE rawvideo raw video D realtext RealText subtitle format D redspark RedSpark D rl2 RL2 DE rm RealMedia DE roq...